The origin of these features was discussed back inJune. There are some really nice geological maps,which show this feature to be a domal uplift, which isonly one of a number of laccoliths and other igneous intrusions. It is just one of several circular features of igneous origin that occur locally.

Two publications on the geology of the area are:Knechtel, M.M., 1944, Oil and gas possibilities of theplains adjacent to the Little Rocky Mountains, Montana:U.S. Geological Survey, Oil and Gas InvestigationsMap OM-4, scale 1:48000.

Dare to Add venture Fur Ther???

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